Q.How are large solar panels cleaned? A.Automated spray systems, much like irrigation systems, are mounted on or near panels to regularly remove dirt. Small manual systems are available with handheld or back-mounted pack devices that spray water onto panels. Why we called our new series "Unique", its can be fix with any type of the panel like polycrystalline, mono perc panel & top con panel You can clean the bifacial solar PV modules this Unique set. This will remove dirt and debris from the surface of the panels without applying too much pressure to the back.